Question

the population of a town increases by 10 % manually if the present population is 22000 find its population a year ago

Answer 1

let last year the population was = X
this year the population should be = X+ 10% of x
X + 10%of X = 22000
X + 10x / 100 = 22000
110x/100 = 22000
X = 22000*100/110 = 20000

Answer 2

Let the population is x

Given : increase by 10%

According to given question -

x + 10/100 = 22000

100x +10x /100 =22000

110x /100 =22000

110x = 22.00,000

x = 22,00,000/110

x = 20,000

Check :

20,000 x 10/100 = 2000

20,000 + 2000 =22,000

Hence : The population a year ago was 20,000